Prof. Dr. Joachim Enders

Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany

Professor for Experimental Nuclear Physics

Prof. Dr. Joachim Enders

Institut für Kernphysik, Technische Universität Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany

Professor for Experimental Nuclear Physics

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Academic Career Length

30Years (1997-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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29 January 2018 in Physical Review Letters

Journal Article

Quasifree (

p

2 p

) Reactions on Oxygen Isotopes: Observation of Isospin Independence of the Reduced Single-Particle Strength

C. A. Bertulani

R^{3}B Collaboration

+96

Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure of stable and exotic oxygen isotopes at the

R^{3} B / LAND

setup with incident beam energies in the range of

300 - 450 MeV / u

. The oxygen isotopic chain offers a large variation of separation energies that allows for a quantitative understanding of single-particle strength with changing isospin asymmetry. Quasifree knockout reactions provide a complementary approach to intermediate-energy one-nucleon removal reactions. Inclusive cross sections for quasifree knockout reactions of the type

{}^{A}O (p, 2 p) {}^{A - 1}N

have been determined and compared to calculations based on the eikonal reaction theory. The reduction factors for the single-particle strength with respect to the independent-particle model were obtained and compared to state-of-the-art ab initio predictions. The results do not show any significant dependence on proton-neutron asymmetry.

19 July 2004 in Physical Review Letters

Journal Article

Reduced Occupancy of the Deeply Bound

0 d_{5 / 2}

Neutron State in

{}^{32}{A r}

Alexandra Gade

D. Bazin

B. A. Brown

Chris Campbell

J. A. Church

K. L. Yurkewicz

+14

The

{}^{9}{B e} ({}^{32}{A r}, {}^{31}{A r}) X

reaction, leading to the

{\frac{5}{2}}^{+}

ground state of a nucleus at the proton drip line, has a cross section of 10.4(13) mb at a beam energy of

65.1 M e V / nucleon

. This translates into a spectroscopic factor that is only 24(3)% of that predicted by the many-body shell-model theory. We introduce refinements to the eikonal reaction theory used to extract the spectroscopic factor to clarify that this very strong reduction represents an effect of nuclear structure. We suggest that it reflects correlation effects linked to the high neutron separation energy (22.0 MeV) for this state.

1 May 2011 in Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

Journal Article

The electron–ion scattering experiment ELISe at the International Facility for Antiproton and Ion Research (FAIR)—A conceptual design study

A.N. Antonov

M.K. Gaidarov

Martin Vasilev Ivanov

D.N. Kadrev

M. Aïche

A. Heinz

+137

30 June 2003 in Physical Review Letters

Journal Article

New Direct Reaction: Two-Proton Knockout from Neutron-Rich Nuclei

D. Bazin

B. A. Brown

Chris Campbell

J. A. Church

D. C. Dinca

J. A. Tostevin

The reaction

{}^{9}{B e} ({}^{28}{M g}, {}^{26}{N e} + γ) X

has been studied at

82 M e V / n u c l e o n

together with two similar cases,

{}^{30}{M g}

and

{}^{34}{S i}

. Strong evidence that the reactions are direct is offered by the parallel-momentum distributions of the reaction residues and by the inclusive cross sections. The pattern of the partial cross sections for

{}^{28}{M g}

suggests the presence of correlations. A preliminary theoretical discussion based on eikonal reaction theory and the many-body shell model is presented. The reaction holds great promise for the study of neutron-rich nuclei.

5 February 2002 in Physical Review C

Journal Article

Dipole and electric quadrupole excitations in

^{40, 48} Ca

T. Hartmann

Joachim Enders

P. Mohr

K. Vogt

S. Volz

A. Zilges

Photon scattering experiments have been performed to investigate the structure of the two doubly magic nuclei

^{40, 48} Ca .

The method is highly selective to induce low-order multipole transitions, i.e.,

E 1,

M 1,

and

E 2

from the ground state. We determined the energies and spins of excited states and the absolute strengths of the

γ

decays in a model independent way. We find the summed electric dipole strengths below 10 MeV to exhaust the energy weighted sum rule by 0.023 and 0.27 %, respectively. The summed electric quadrupole strengths are

\sum B (E 2) ↑ = 332 e^{2} {fm}^{4}

and

407 e^{2} {fm}^{4}

for

^{40} Ca

and

^{48} Ca,

respectively. In order to explain the difference in the

E 1

strengths of the two isotopes several theoretical models are discussed.

30 November 2005 in Physical Review C

Journal Article

Measurement of

E 2

transition strengths in

{}^{32, 34}{Mg}

J. A. Church

Chris Campbell

D.-C. Dinca

Joachim Enders

Alexandra Gade

K. L. Yurkewicz

The degree of collectivity in the neutron-rich nuclei

{}^{32}{Mg}

and

{}^{34}{Mg}

has been determined via intermediate-energy Coulomb excitation in inverse kinematics. Measured energies of the first excited

2^{+}

states and reduced electric quadrupole transition probabilities

B (E 2; 0_{g.s.}^{+} \to 2_{1}^{+})

are presented for

{}^{32}{Mg}

and

{}^{34}{Mg}

. The results agree with previous measurements and confirm the placement of both nuclei within the “island of inversion.”

About Me

CV 1995 Dipl.-Phys. (M.Sc. equiv.), TU Darmstadt 2000 Dr. rer. nat., TU Darmstadt 2000-2002 Research Associate, NSCL/Michigan State Univ. 2002-2008 Junior professor, TU Darmstadt since 2008 Professor W2, TU Darmstadt Research Profile Particle Accelerators: Electron Sources Nuclear Photonics: Photonuclear Reactions and Photofission Nuclear Structure Physics: Production, Decay, and Reactions with Radioactive Ion Beams Teaching: Inverted Classroom Model, Introductory-level Physics for Engineering Students Specialized Courses in Nuclear and Accelerator Physics Service 2006-2008 Departmental Chairperson for Teaching and the Curriculum since 2006 TU Darmstadt NEA Liaison Officer since 2007 TU Darmstadt Advisory Board Member at the Joint Universities Accelerator School (JUAS) 2014-2018 Departmental Chairperson for Teacher Education in Physics Since 2018 Chairperson MSc Exam Committee 2020 Spokesperson LOEWE Project Nuclear Photonics 2021-2025 Spokesperson DFG RTG 2128 AccelencE

Prof. Dr. Joachim Enders

Prof. Dr. Joachim Enders

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